** Man of Leisure **
Typically, I will measure the combined sub response with Dirac turned off. If it looks like the response might benefit from applying PEQ, I use REW to calculate the PEQ, and apply if before running Dirac. Example:With a response curve that will need some pulling down of these peaks and a MiniDSP 2x4HD and a NAD 758v3 with Dirac should I:
a.) Do autoEQ with REW into the MiniDSP and let Dirac do the rest
b.) Just let miniDSP handle the worst peaks with a negative HSQ and a little LSQ and then let Dirac do the rest
c.) let Dirac in the NAD do everything and the MiniDSP just for consolidation of the 3 subwoofers (distance/gain) following Jerry's guide
I am not sure what the best approach would be as far as headroom and dynamics are concerned.
Also with my Crown XLS 2502 Amp would it be better to put the input attenuaters to full and lower the sub signal with the MiniDSP (MV)? The amp is a bit too powerful for 4 JBL I was told.
I will be running 12 JBLs, each 4 JBL will get its own 2502 bridged.
After PEQ has been applied, Dirac has an easier job placing the finishing touches on the combined sub response.
And finally, don't forget to experiment with the sub distance tweak to optimize the alignment between subs and mains.
I don't have an opinion WRT the signal level into your amp.